qmqpd

QMQPD(8)QMQPD(8)

NAME

qmqpd - Postfix QMQP server

SYNOPSIS

qmqpd [generic Postfix daemon options]

DESCRIPTION

The Postfix QMQP server receives one message per connection. Each mes-
sage is piped through the cleanup(8) daemon, and is placed into the
incoming queue as one single queue file. The program expects to be run
from the master(8) process manager.
The QMQP server implements one access policy: only explicitly autho-
rized client hosts are allowed to use the service.

SECURITY

The QMQP server is moderately security-sensitive. It talks to QMQP
clients and to DNS servers on the network. The QMQP server can be run
chrooted at fixed low privilege.

DIAGNOSTICS

Problems and transactions are logged to syslogd(8).

BUGS

The QMQP protocol provides only one server reply per message delivery.
It is therefore not possible to reject individual recipients.
The QMQP protocol requires the server to receive the entire message
before replying. If a message is malformed, or if any netstring compo-
nent is longer than acceptable, Postfix replies immediately and closes
the connection. It is left up to the client to handle the situation.

CONFIGURATION PARAMETERS

Changes to main.cf are picked up automatically, as qmqpd(8) processes
run for only a limited amount of time. Use the command "postfixreload"
to speed up a change.
The text below provides only a parameter summary. See postconf(5) for
more details including examples.

CONTENT INSPECTION CONTROLS

content_filter(empty)
The name of a mail delivery transport that filters mail after it
is queued.
receive_override_options(empty)
Enable or disable recipient validation, built-in content filter-
ing, or address mapping.

RESOURCE AND RATE CONTROLS

line_length_limit(2048)
Upon input, long lines are chopped up into pieces of at most
this length; upon delivery, long lines are reconstructed.
hopcount_limit(50)
The maximal number of Received: message headers that is allowed
in the primary message headers.
message_size_limit(10240000)
The maximal size in bytes of a message, including envelope
information.
qmqpd_timeout(300s)
The time limit for sending or receiving information over the
network.

TROUBLE SHOOTING CONTROLS

debug_peer_level(2)
The increment in verbose logging level when a remote client or
server matches a pattern in the debug_peer_list parameter.
debug_peer_list(empty)
Optional list of remote client or server hostname or network
address patterns that cause the verbose logging level to
increase by the amount specified in $debug_peer_level.
soft_bounce(no)
Safety net to keep mail queued that would otherwise be returned
to the sender.

TARPIT CONTROLS

qmqpd_error_delay(1s)
How long the QMQP server will pause before sending a negative
reply to the client.

MISCELLANEOUS CONTROLS

config_directory(see â€â€™postconf-dâ€â€™ output)
The default location of the Postfix main.cf and master.cf con-
figuration files.
daemon_timeout(18000s)
How much time a Postfix daemon process may take to handle a
request before it is terminated by a built-in watchdog timer.
ipc_timeout(3600s)
The time limit for sending or receiving information over an
internal communication channel.
max_idle(100s)
The maximum amount of time that an idle Postfix daemon process
waits for the next service request before exiting.
max_use(100)
The maximal number of connection requests before a Postfix dae-
mon process terminates.
process_id(read-only)
The process ID of a Postfix command or daemon process.
process_name(read-only)
The process name of a Postfix command or daemon process.
qmqpd_authorized_clients(empty)
What clients are allowed to connect to the QMQP server port.
queue_directory(see â€â€™postconf-dâ€â€™ output)
The location of the Postfix top-level queue directory.
syslog_facility(mail)
The syslog facility of Postfix logging.
syslog_name(postfix)
The mail system name that is prepended to the process name in
syslog records, so that "smtpd" becomes, for example, "post-
fix/smtpd".
verp_delimiter_filter(-=+)
The characters Postfix accepts as VERP delimiter characters on
the Postfix sendmail(1) command line and in SMTP commands.